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| Paper: |
Polarimetry with GREGOR |
| Volume: |
437, Solar Polarization Workshop 6 |
| Page: |
351 |
| Authors: |
Balthasar, H.; Bello González, N.; Collados, M.; Denker, C.; Feller, A.; Hofmann, A.; Lagg, A.; Nagaruju, L.; Puschmann, K. G.; Soltau, D.; Volkmer, R. |
| Abstract: |
A brief description of the new 1.5-meter solar telescope GREGOR
located at the Observatorio del Teide in Tenerife will be given.
GREGOR will provide a spatial resolution of about 75 km on the
Sun, and with its light collecting capability we will be able to
study the development of small magnetic features with high cadence.
From the beginning, it will be equipped with the GREGOR Fabry-Pérot
Interferometer (GFPI) for the visible spectral range and with a
GRating Infrared Spectrograph (GRIS). Both postfocus instruments
can be combined with a polarimeter, and in both cases the light is
modulated by two ferro-electric liquid crystals. A calibration unit
can be inserted to determine the instrumental polarization.
Because of the altazimuthal mount, time-dependent rotation of the
polarimetric reference plane is introduced, and we have to
develop a polarization model of the telescope. Measurements to
verify this model are in preparation. |
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